diff --git a/.bumpversion.cfg b/.bumpversion.cfg
index a2976d98..cca2b743 100644
--- a/.bumpversion.cfg
+++ b/.bumpversion.cfg
@@ -1,5 +1,5 @@
 [bumpversion]
-current_version = 0.4.0-dev
+current_version = 0.4.0
 tag = True
 sign_tags = True
 tag_message = intx {new_version}
diff --git a/CHANGELOG.md b/CHANGELOG.md
index 55ae70b3..f3b2ba16 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -6,7 +6,7 @@ The format is based on [Keep a Changelog],
 and this project adheres to [Semantic Versioning].
 
 
-## [0.4.0] - unreleased
+## [0.4.0] - 2019-08-21
 
 ### Added
 
@@ -35,8 +35,8 @@ and this project adheres to [Semantic Versioning].
   [[#99](https://github.com/chfast/intx/pull/99)]
 
 
-[0.4.0]: https://github.com/chfast/intx/compare/v0.3.0...master
-[0.3.0]: https://github.com/chfast/intx/releases/v0.2.0
+[0.4.0]: https://github.com/chfast/intx/releases/v0.4.0
+[0.3.0]: https://github.com/chfast/intx/releases/v0.3.0
 
 [Keep a Changelog]: https://keepachangelog.com/en/1.0.0/
 [Semantic Versioning]: https://semver.org
diff --git a/CMakeLists.txt b/CMakeLists.txt
index 0cd23c8b..de1671c3 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -22,7 +22,7 @@ cable_set_build_type(DEFAULT Release CONFIGURATION_TYPES Release;Debug)
 include(Hunter/init)
 
 project(intx LANGUAGES CXX)
-set(PROJECT_VERSION 0.4.0-dev)
+set(PROJECT_VERSION 0.4.0)
 
 cable_configure_compiler(NO_STACK_PROTECTION)